Brossard Real-Time AQI Tracker
What's Actually In Brossard Air Today?
What High AQI Means for Your Lungs in Brossard
How to Read AQI
The Air Quality Index (AQI) measures how polluted the air is and how it may affect your health.
0â50 (Good): Air quality is satisfactory.
51â100 (Moderate): Acceptable, but some pollutants may pose minor concerns.
101â150 (Unhealthy for Sensitive Groups)
151â200 (Unhealthy)
201â300 (Very Unhealthy)
301+ (Hazardous)
Moderate
Still okay for most, but if you have asthma or allergies, take it easy and avoid long outdoor workouts.
Shop MERV 11 filtersâWhat's the Right Filter for Your AQI Level?
Check Today's Live Real Time Air Quality Index AQI Map in Brossard, QC Now
Air quality in Brossard, a South Shore city across the St. Lawrence from Montréal, can change from hour to hour, and the live map above shows where things stand right now on the U.S. AQI (0 to 500, where 0 to 50 is good). When Filterbuy looked into how Brossard's air is measured, we found the city has no federal AQHI forecast of its own. For local health guidance, pair the map with Québec's IQA (Indice de la qualité de l'air) and the Montréal AQHI forecast. See also Filterbuy's live air quality map for Canada.
TL;DR
Start with the live map, then check it against Québec's IQA and the Montréal AQHI forecast. Brossard's air most often turns poor during summer wildfire smoke and on calm, cold winter nights. Indoors, a clean, well-fitted furnace filter or a portable air cleaner cuts down on fine particles.
Key Takeaways
The live map on this page uses the U.S. AQI. Québec's official index is the IQA, and Canada's health index is the AQHI.
On the IQA, 25 or below is good, 26 to 50 is acceptable, and anything above 50 is poor.
Environment Canada only issues AQHI forecasts in Québec for Montréal, Québec City, and Gatineau, so Brossard residents rely on the Montréal forecast.
How to Read the Brossard Air Quality Map and Compare Canadian Scales
The live map uses the U.S. AQI, the scale most global trackers use. Québec has its own scale, the IQA, and Canada's federal Air Quality Health Index (AQHI) runs from 1 to 10+. Because each is built differently, the numbers don't translate directly.
Filterbuy's three-check method keeps it simple: use the map for a quick read, the IQA for the official provincial reading, and the Montréal AQHI forecast for health advice.
Sources: DonnĂ©es QuĂ©bec – IQA; Canada.ca – AQHI.
What AQHI Categories Mean for Your Health in Brossard
The AQHI rolls the health effects of ozone, nitrogen dioxide, and fine particles into a single number from 1 to 10+. The advice depends on whether you're in a higher-risk group.
If you're managing a health condition, follow your doctor's advice.
Why Brossard Air Quality Readings Can Look Different
Two sites can show different numbers for Brossard at the same moment, usually for one of these reasons:
Different scales. Some trackers convert Québec's IQA data to the U.S. scale, so a "good" 40 on the map can line up with an acceptable IQA reading.
Different stations. Québec monitors Brossard at two stations, but other maps may draw on Montréal stations or low-cost sensors.
Different timing. An hourly reading rarely matches a rolling or daily average, and during wildfire smoke the AQHI switches to an hourly, PM2.5-only formula.
For the most reliable information, refer to official Québec and federal sources when comparing results.
Is It Safe to Be Outside in Brossard Today?
On most days, yes. Before a run or a walk around Quartier DIX30, run Filterbuy's three checks first. If the AQHI reaches 7 or the IQA turns poor, keep activity shorter and lighter, especially for children, older adults, and anyone with asthma or heart disease. In heavy wildfire smoke, Environment Canada says everyone's health is at risk. Filterbuy's guide explains why the air quality is bad today.
Where to Find Brossard Air Quality Forecasts
Since Brossard has no AQHI forecast of its own, bookmark these official sources:
Montréal AQHI forecast on weather.gc.ca, the closest federal forecast.
Info-Smog, the CanadaâQuĂ©bec smog forecast based on the IQA.
Québec's real-time IQA from the MELCCFP, broken down by station.
The WeatherCAN app, for alerts on your phone.
Air Quality Across Brossard Neighbourhoods and Postal Codes
Air quality is fairly even across Brossard, though homes near Autoroutes 10, 15, 20, and 30, Route 132, or Boulevard Taschereau can see more traffic-related nitrogen dioxide at rush hour. Wood smoke can also settle into streets on calm winter nights. Here's what to do when a neighbour's wood smoke gets into your home.
Monitoring is regional, so no source reports air quality by postal code; the nearer of Brossard's two provincial stations is your best guide.
Major Air Pollutants in Brossard: PM2.5, Ozone, and More
Fine particulate matter (PM2.5) is the pollutant most likely to push Brossard into poor territory. It comes mainly from smoke and exhaust, and the particles can reach deep into the lungs. Ground-level ozone tends to build on hot, sunny summer afternoons, while nitrogen dioxide (NO2) comes mostly from heavy traffic on the South Shore's bridges and highways. The parc Océanie station measures all three; the parc Sorbonne station tracks PM2.5 and ozone.
How Brossard Compares With Nearby Cities
Brossard shares its air with Montréal, Longueuil, Saint-Lambert, and La Prairie, so a wildfire smoke event tends to reach them all at once. Daily differences come from local traffic and wood smoke. To compare today, check the live map or Montréal's RSQA network.
Brossard Air Quality Alerts and What to Do
Environment Canada issues colour-coded air quality alerts (yellow, orange, or red) for greater Montréal, including Brossard, and Info-Smog issues smog warnings for Québec regions. On the morning of 26 July 2025, smoke from Prairie wildfires led IQAir to rank Montréal's air quality the worst in the world.
When an alert is issued:
Keep windows and doors closed.
Cut back on strenuous outdoor activity.
Follow Filterbuy's rule: when the live map shows a U.S. AQI above 100, the AQHI reaches 7 or higher (high risk), or the IQA turns poor (above 50), take two steps together:
If your home has a forced-air furnace or central ventilation system, switch to a MERV 13 filter. Check first that your system is rated for MERV 13.
Run a HEPA air purifier, sized for the room, in each room you use.
Check in on neighbours who may be more vulnerable.
After the smoke clears, remember Filterbuy's two-clock model: filters clear airborne particles in hours to days, but surface residue has to be cleaned. Our wildfire smoke recovery checklist covers both.
Improving Indoor Air in Brossard Homes Without Central HVAC
Many Brossard condos and homes heat with electric baseboards, so there's no central filter. You still have options:
Use a portable air cleaner with a HEPA filter, sized for the room you use most.
Keep windows closed during smoke or smog episodes, and set window air conditioners to recirculate.
Skip wood fires and candles when outdoor air is poor.
If your building has an air exchanger (HRV or ERV), keep its filters clean.
Filterbuy's Perspective on Brossard Air Quality
Filterbuy has made air filters in the U.S. for over a decade and shipped them to more than two million households. We've noticed a clear pattern: filter orders and support calls climb after major smoke events, often before homeowners check their filter.
âOver the past few fire seasons, the reader question has shifted from âwhat does this number meanâ to âwhy did my house still smell smoky after the map turned green.â That gap almost always traces back to one thing: what was in the HVAC filter before the smoke arrived.â
â Michelle Wan, Brand Manager and Air Quality Writer, Filterbuy
Filterbuy's Brossard Filter Calendar
In 2010, Environment Canada counted 17 winter smog days versus 7 in summer on the island of Montréal, mostly from wood heating.
Choosing the Right Air Filter for Brossard Air Quality
Filterbuy's MERV system makes it easy to match a filter to your household:
First, check that your furnace is rated for a higher MERV. Filterbuy makes over 600 filter sizes and ships free to Canada with no minimum, and Subscribe & Save lets you edit, skip, or cancel anytime. If cooking or smoke smells linger, Odour Eliminator filters add an activated carbon layer.
Supporting Statistics: Air Quality in Brossard and Québec
1. Air pollution is linked to 17,400 premature deaths a year in Canada.
Québec accounts for about 4,300, or 50 per 100,000 people, among the highest provincial rates.
The Montréal-area rate is 57 per 100,000.
Source: Health Canada, 2024 report
2. Southern Québec averages 237 "good" air quality days a year.
That leaves roughly one day in three rated acceptable or poor on the IQA (2017â2024).
Montérégie, Brossard's region, usually has among the fewest good days.
3. Wildfire smoke contributes to up to 2,500 deaths a year in Canada through long-term exposure.
Short-term exposure is linked to up to 240 more each year (2013â2018).
Frequently Asked Questions
Is the air quality bad in Brossard today?
Check the live map. A U.S. AQI above 100, an IQA above 50, or an AQHI of 7 or higher means the air is poor for at least some people.
What is a good AQI in Brossard?
On the map, 0 to 50 is good. On Québec's IQA, good means 25 or below.
Does Brossard have its own AQHI forecast?
No. Use Environment Canada's Montréal forecast.
What PM2.5 level is poor in Brossard?
Québec's IQA rates air as poor once PM2.5 goes above 35 ”g/m³, averaged over three hours.
Should I change my furnace filter when air quality is bad?
Yes. Filterbuy's rule is to switch to MERV 13 once the AQI tops 100, as long as your system is rated for it.
Glossary
AQI (Air Quality Index): The U.S. EPA's 0 to 500 scale, used by the live map.
AQHI (Air Quality Health Index): Canada's 1 to 10+ health-based index.
IQA (Indice de la qualité de l'air): Québec's official air quality index; 50 marks the upper acceptable limit.
Info-Smog: The CanadaâQuĂ©bec smog forecast and warning program.
MELCCFP: Québec's environment ministry.
PM2.5: Fine particles 2.5 micrometres or smaller, mostly from smoke and combustion.
Ozone (O3): A gas that forms near the ground on hot, sunny days.
NO2 (nitrogen dioxide): A gas produced mainly by vehicles and fuel burning.
MERV: Minimum Efficiency Reporting Value, a 1 to 16 rating of how well a filter captures particles.
RSQA: Ville de Montréal's air quality monitoring network.